In a reflector antenna[?], the relative reduction in the effective aperture of the antenna caused by the masking effect of other antenna parts, such as a feed horn or a secondary reflector, which parts obstruct the radiation path.
... in the town is $75,076, and the median income for a family is $79,745. Males have a median income of $46,444 versus $34,000 for females. The per capita income for the town ...